作战线 meaning in English

line of operations

But each guerrilla area has a small rear of its own , upon which it relies to establish its fluid battle lines
但在每一游击区中，仍自有其小规模的后方，并依以建立非固定的作战线。
The case is different with the guerrilla detachments which are dispatched by a guerrilla area for short - term operations in the rear of the enemy in the same area ; such detachments have no rear , nor do they have a battle line
和这个区别的，是每一游击区派遣出去向该区敌后临时活动的游击队，他们不但没有后方，也没有作战线。